The ornamental design for a horsebit, as shown and described.
FIG. 1 is a perspective view of a horse bit in accordance with the present invention with bit rings illustrated with broken lines as unclaimed environmental structure;
FIG. 2 is a front view of the horse bit of FIG. 1 with bit rings illustrated with broken lines as unclaimed environmental structure;
FIG. 3 is a reduced perspective view of a horse bit of in accordance with the present invention with rings and harness materials illustrated in broken lines as unclaimed environmental elements;
FIG. 4 is a reduced partial perspective view of a horse bit in accordance with the present invention with rings, harness components, and an animal mouth in broken lines to illustrate unclaimed environmental structure; and,
FIG. 5 is a rear view of a horse bit in accordance with the present invention with bit rings illustrated with broken lines as unclaimed environmental structure.